Grassy Dam Reservoir Report
Nearby: Holtzgraph Dam Overhill Dam
Last Updated: February 23, 2026
Grassy Dam, also known as Swamp Creek Dam, is located in Hanover, Virginia, along the Grassy Swamp Creek.
Summary
This earth dam stands at a height of 15 feet and spans a length of 400 feet, providing a storage capacity of 194 acre-feet. While the primary purpose of Grassy Dam is for recreation, it is also regulated and inspected by the Department of Conservation and Recreation in Virginia.
Despite its undetermined hazard potential and unrated condition assessment, Grassy Dam remains a popular spot for water resource and climate enthusiasts to visit. The dam's location in Hanover County offers a tranquil setting for outdoor activities such as fishing, boating, and wildlife observation. With its scenic surroundings and ample storage capacity, Grassy Dam serves as a vital resource for both recreational enjoyment and water management in the region.
°F
°F
mph
Wind
%
Humidity
15-Day Weather Outlook
Dam Length |
400 |
Dam Height |
15 |
River Or Stream |
Grassy Swamp Creek |
Hydraulic Height |
15 |
Nid Storage |
194 |
Structural Height |
15 |
Hazard Potential |
Undetermined |
Nid Height |
15 |
Seasonal Comparison
5-Day Hourly Forecast Detail
Nearby Streamflow Levels
South Anna River Near Ashland
|
596cfs |
James River And Kanawha Canal Near Richmond
|
131cfs |
James River Near Richmond
|
21100cfs |
Little River Near Doswell
|
170cfs |
North Anna River At Hart Corner Near Doswell
|
270cfs |
Pamunkey River Near Hanover
|
1270cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Grassy Dam